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MCBA FOR SPECIALISTS:
INSTALLER, SERVICE ENGINEER
PILOT MODE
Pilot mode
After you power down the appliance the screen displays Pilot mode,
as shown in the figure above.
This is the standard MCBA mode.The MCBA automatically returns
to this mode after 20 minutes if no keys have been pressed on the
screen. Any parameters that were modified are then enabled.
The first character shows the current status of the boiler depending
on the condition of both the boiler and the burner. The last
2 characters indicate the start temperature.
If the burner is blocked for one of the reasons mentioned above, the
screen display alternates between a 9 followed by the temperature
(two last digits) and b with the error code.
Pilot, no demand for heat
Fan first, fan after
Ignition
Operation of the boiler burner for the heating
Operation of the boiler burner for the domestic hot
water
Air pressure limit or obtaining the number of start
revolutions.
The burner goes out when the specified value is
reached. A demand for heat is present nonetheless.
Pump over-run time after the demand for domestic
hot water
Pump over-run time after the demand for central
heating
Burner blocked:
• :T1 > 95°C
• :T2 > 95°C
• :T2 - T1 > 10.20 or 40°C after a time of xx
• :dT1/dt > maximum gradient T1
• :water pressure switch not off
• :no fan signal
• :erroneous fan signal
• :T1 - T2 > max Delta
• : NTC3 short-circuit
• : NTC3 interrupt
• :wait for the fan to start
Status Boiler function
Internal check — three-way valve
Boiler burner in hot water ready function
Test function: Central heating high power
Test function: Central heating low power
Test function: Boiler with fixed number of
revolutions
Status Boiler function
Once the cause of the blockage has been resolved, the burner starts
automatically within 150 seconds at most.